| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| MIDNIGHT OIL LIMITED | 03952876 | 21/03/2000 | Dissolved |
| Midnight Oil (1984) Ltd | 01814579 | 25/12/1991 | Dissolved |
| Midnight Oil Ltd | 02013491 | 21/05/1992 | Dissolved |
| Telerian Systems Ltd | 03767366 | 17/11/1999 | Dissolved |
| Telerian Systems Ltd | 03767366 | 19/05/1999 | Dissolved |
| j r hayes (uk) ltd | 02350858 | 16/08/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ADVANTICA INTELLECTUAL PROPERTY LIMITED | 02732228 | 23/09/1993 | 01/03/1996 | Gold |
| BG GREAT BRITAIN LIMITED | 00909162 | 23/09/1993 | 01/03/1996 | Amber |
| BG INTERNATIONAL LIMITED | 00902239 | 23/09/1993 | 01/03/1996 | Gold |
| BG NORTH SEA HOLDINGS LIMITED | 02383911 | 23/09/1993 | 01/03/1996 | Silver |
| BG SOUTH EAST ASIA LIMITED | 02334822 | 23/09/1993 | 01/03/1996 | Not Trading |
| BG THAILAND LIMITED | 02466384 | 23/09/1993 | 01/03/1996 | Dissolved |
| CEDARLET LIMITED | 02359523 | 24/09/1991 | 31/03/2000 | Bronze |
| JORDAN ENERGY AND MINING LIMITED | 05753610 | 17/08/2011 | 28/02/2016 | Dissolved |
| SERICA ENERGY (UK) LIMITED | 04073712 | 09/06/2006 | 10/04/2011 | Bronze |
| SERICA ENERGY PLC | 05450950 | 01/09/2005 | 10/04/2011 | Gold |
| SERICA HOLDINGS UK LIMITED | 01814572 | 31/07/2007 | 31/03/2012 | Bronze |
| SHELL TRINIDAD AND TOBAGO LIMITED | 02386676 | 23/09/1993 | 01/03/1996 | Silver |
| SHELL TUNISIA UPSTREAM LIMITED | 02750465 | 23/09/1993 | 01/03/1996 | Gold |
| SPIRIT ENERGY PRODUCTION UK LIMITED | 03115179 | 30/01/1996 | 29/11/1996 | Gold |